Light-emitting diode (LED) backlight driving circuit and liquid crystal display device
A technology of backlight drive circuit and LED light bar, which is applied in lighting devices, light sources, electric light sources, etc., and can solve the problems of increasing chip area and cost
Active Publication Date: 2015-07-15
CHANGSHA HKC OPTOELECTRONICS CO LTD
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- Application Information
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Problems solved by technology
The existing LED backlight drive circuit needs to occupy two pins of the constant current drive chip, which increases the area and cost of the chip
Method used
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[0022] see figure 2 , The invention discloses a liquid crystal display device, and the liquid crystal display device includes an LED backlight driving circuit. The LED backlight drive circuit includes a constant current drive chip, a power module, an LED light bar coupled with the power supply module, and a dimming module coupled with the LED light bar; the LED backlight drive circuit also includes a low-pass filter; the constant current drive chip integrates multiplier;
[0023] The gate signal and the dimming signal generated by the constant current driver chip are respectively coupled to the input terminals of the multiplier; the output terminal of the multiplier is coupled to the power supply module and coupled to the dimming module through a low-pass filter.
[0024] The present invention finds that when the dimming signal is at a low level, the voltage-regulated gate signal is also at a low level, but when the gate signal is at a low level, the dimming signal is not ne...
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An LED backlight drive circuit (1) and a liquid crystal display device. The LED backlight drive circuit (1) comprises a constant current drive chip (10), a power source module (20), an LED light bar (30) coupled to the power source module (20), and a dimming module (40) coupled to the LED light bar (30). The LED backlight drive circuit (1) further comprises a low-pass filter (50). A multiplier (11) is integrated in the constant current drive chip (10). A gate signal and a dimming signal which are generated by the constant current drive chip (10) are respectively coupled to an input end of the multiplier (11), and an output end of the multiplier (11) is coupled to the power source module (20) and is coupled to the dimming module (40) through the low-pass filter (50). The constant current drive chip (10) can simultaneously realize voltage regulation and dimming functions only by one output pin, thereby reducing the requirement of the constant current drive chip (10) and facilitating the reduction of the cost of the constant current drive chip (10).
Description
technical field [0001] The invention relates to the field of liquid crystal display, and more specifically relates to an LED backlight driving circuit and a liquid crystal display device. Background technique [0002] Liquid crystal display devices such as LCD TVs include liquid crystal panels and backlight modules. For backlight modules that use LEDs as backlight sources, LED backlight drive circuits must be selected. The existing LED backlight drive circuits include constant current drive chips. Such as figure 1 As shown, the constant current driver chip includes two control pins, one pin outputs the gate signal, which is used to adjust the driving voltage of the LED backlight drive circuit; the other pin outputs the PWM dimming signal, which is used to adjust the LED light bar. brightness. The existing LED backlight driving circuit needs to occupy two pins of a constant current driving chip, which increases the area and cost of the chip. Contents of the invention [...
Claims
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IPC IPC(8): G09G3/34G09G3/36
CPCG09G2320/064G09G3/3413H05B33/0818H05B45/375H05B45/38
Inventor 胡安乐
Owner CHANGSHA HKC OPTOELECTRONICS CO LTD